diff --git a/include/boost/fusion/container/map/detail/deref_data_impl.hpp b/include/boost/fusion/container/map/detail/deref_data_impl.hpp
index 9943171a..07087a39 100644
--- a/include/boost/fusion/container/map/detail/deref_data_impl.hpp
+++ b/include/boost/fusion/container/map/detail/deref_data_impl.hpp
@@ -39,7 +39,7 @@ namespace boost { namespace fusion { namespace extension
             static type
             call(It const& it)
             {
-                return deref(it).second;
+                return fusion::deref(it).second;
             }
         };
     };
diff --git a/include/boost/fusion/container/map/detail/deref_impl.hpp b/include/boost/fusion/container/map/detail/deref_impl.hpp
index 359a5dc0..725477bd 100644
--- a/include/boost/fusion/container/map/detail/deref_impl.hpp
+++ b/include/boost/fusion/container/map/detail/deref_impl.hpp
@@ -36,7 +36,7 @@ namespace boost { namespace fusion { namespace extension
             static type
             call(It const& it)
             {
-                return at<typename It::index>(it.seq->get_data());
+                return fusion::at<typename It::index>(it.seq->get_data());
             }
         };
     };